Sweet Osmanthus
Osmanthus fragrans · Fragrant Olive · Sweet Olive · Tea OliveUSDA | Grow Zone
8-10Outdoors all year in zones 8 to 10. Anywhere colder, keep it as a houseplant. Protect it below 32°F.
- Light
- Full sun to partial shade
- Water
- When top inch is dry
- Humidity
- 40-60%
- Temperature
- 60-75°F
- Difficulty
- Intermediate
- Growth
- Moderate
- Mature size
- 8-10 ft tall, 6-8 ft wide
- Pets
- Non-toxic to pets
Osmanthus fragrans, commonly known as Sweet Osmanthus, is a fragrant shrub native to Asia, prized for its aromatic flowers. This versatile plant is often grown for its beauty and delightful scent, making it a favorite in gardens and landscapes.
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Ideal temperature
60-75°F is where it grows fastest. Below 32°F cold damage starts.
Spacing and harvest
- Mature size
- 8-10 ft tall, 6-8 ft wide
- Plant apart
- 72-96 in
- Frost
- Half hardy: light frost only
Everything it needs
9 essentials at a glance
Watering
Osmanthus fragrans prefers consistently moist soil but should not be waterlogged.
Water deeply when the top inch of soil feels dry, typically every 1-2 weeks. During the growing season (spring and summer), increase watering frequency, while in fall and winter, reduce it. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause leaf drop and wilting.
Light
This plant thrives in full sun to partial shade, ideally receiving 6-8 hours of sunlight daily.
It can tolerate some shade but may produce fewer flowers. For optimal growth, place it in a location where it receives morning sun and afternoon shade, especially in hotter climates.
Soil
Osmanthus fragrans prefers well-draining, loamy soil with a pH range of 6.0 to 7.0.
A mix of potting soil, compost, and perlite is recommended to ensure good drainage. Avoid heavy clay soils that retain water, as this can lead to root rot.
Humidity
This plant enjoys moderate humidity levels, ideally between 40-60%.
To increase humidity, consider misting the leaves or placing a humidifier nearby. Signs of low humidity stress include browning leaf tips and leaf drop.
Temperature
Osmanthus fragrans thrives in temperatures ranging from 60-75°F (15-24°C) and is hardy in USDA zones 8-10.
It can tolerate brief cold snaps but should be protected from frost. In extreme heat, provide some afternoon shade to prevent leaf scorch.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or similar during the growing season.
Fertilize every 4-6 weeks from spring to early fall. Signs of nutrient deficiency include yellowing leaves, poor growth, and reduced flowering.
Pruning
Prune Osmanthus fragrans after flowering to maintain shape and encourage bushier growth.
Use sharp, clean pruning shears to remove dead or crossing branches. Deadheading spent flowers can also promote new blooms. Avoid heavy pruning, as this can reduce flowering in the following season.
Repotting
Repot every 2-3 years or when the roots become pot-bound.
Choose a pot that is 1-2 inches larger in diameter. Signs that it needs repotting include roots growing out of the drainage holes and stunted growth. When repotting, gently loosen the roots and place in fresh potting mix.
Propagation
Propagation can be achieved through semi-hardwood cuttings or layering.
For cuttings, take 4-6 inch sections in late summer, remove lower leaves, and dip in rooting hormone. Plant in a well-draining mix and keep moist until roots develop. Layering can be done by bending a low branch to the ground and covering it with soil until roots form, usually in a year.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or nutrient deficiency.
How to fix it
Check soil moisture and reduce watering frequency. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Leaf drop
Why it happens
Under-watering or sudden temperature changes.
How to fix it
Ensure consistent watering and protect the plant from drafts or sudden temperature fluctuations.
Root rot
Why it happens
Poor drainage or over-watering.
How to fix it
Improve drainage by repotting in fresh, well-draining soil and reduce watering frequency.
Pest infestation (e.g., aphids)
Why it happens
High humidity and poor air circulation.
How to fix it
Increase air circulation around the plant and treat with insecticidal soap if necessary.
Fading flower fragrance
Why it happens
Insufficient sunlight or nutrient deficiency.
How to fix it
Ensure the plant receives adequate sunlight and fertilize during the growing season.
Care through the year
Spring
In spring, resume regular watering and begin fertilizing every 4-6 weeks. Prune after flowering to shape the plant and encourage new growth.
Summer
During summer, ensure consistent moisture and provide some afternoon shade in extremely hot weather. Monitor for pests and treat as needed.
Fall
In fall, gradually reduce watering as the plant enters dormancy. Continue to monitor for pests and prepare for cooler temperatures.
Winter
In winter, protect the plant from frost and cold drafts. Water sparingly, allowing the soil to dry out slightly between waterings.
Toxicity & Safety
Osmanthus fragrans is generally considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. Always monitor pets around plants.
Good to know
How often should I water my Sweet Osmanthus?
Water your Sweet Osmanthus when the top inch of soil feels dry, typically every 1-2 weeks. Adjust frequency based on seasonal changes.
Why are my Osmanthus leaves turning yellow?
Yellowing leaves can indicate over-watering or a nutrient deficiency. Check your watering schedule and consider fertilizing if needed.
What is the best light for Osmanthus fragrans?
Osmanthus fragrans thrives in full sun to partial shade, ideally receiving 6-8 hours of sunlight daily for optimal growth and flowering.
How do I propagate Sweet Olive?
You can propagate Sweet Olive through semi-hardwood cuttings or layering. Take cuttings in late summer or bend a branch to root in soil.
When should I prune my Osmanthus?
Prune your Osmanthus after flowering to encourage bushier growth and remove any dead or crossing branches for better air circulation.
What are the signs of root rot in Osmanthus?
Signs of root rot include yellowing leaves, wilting, and a foul smell from the soil. Ensure proper drainage and adjust watering accordingly.
Is Sweet Osmanthus toxic to pets?
Sweet Osmanthus is generally non-toxic to pets and children, but ingestion of large amounts may cause mild gastrointestinal upset.
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